<template>
  <div>
    <h4>第三题</h4>
    <p>{{fn}}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [
        {
          name: "小明",
          age: 18,
        },
        {
          name: "小花",
          age: 25,
        },
        {
          name: "小爱",
          age: 21,
        },
      ],
    };
  },
  computed:{
      fn(){
      return this.arr.reduce((sum,obj) => {
          sum += obj.age
          return sum
      },0) 
     
    }
  }
};
</script>

<style scoped>
</style>